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Hysteretic Behaviour of Stockbridge Dampers: Modelling and Parameter Identification

机译：Stockbridge阻尼器的滞回特性：建模和参数辨识

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摘要

Stockbridge dampers are widely used to mitigate the vortex-induced vibrations of overhead electrical line conductors and of many other cable or cable-like structures exposed to the action of wind. Aim of this work is to develop a simple, but accurate, mechanical model of a Stockbridge damper to use in the assessment of such structures vibrations. The model is based on a beam-like description of the messenger cable and on a nonlinear formulation of the cross sections cyclic bending behaviour. At the cross-sectional level, the mechanical behaviour of the messenger cable is reproduced with the classic Bouc-Wen hysteretic model, which has been recognized as adequate to represent the local behaviour mainly controlled by interwire sliding processes. The Bouc-Wen model parameters are identified from experimental results available in literature and used at the local (cross-sectional) level to characterize the mechanical behaviour of the messenger cable. The descending global behaviour of the Stockbridge damper compares very favourably with the experimental results in terms of the impedance function at the clamp and allows for the confident use of the proposed model inside the assessing process of full power lines. The important role of the end zones of the messenger cable is highlighted. In these zones, a boundary layer like transition is found to occur for the bending stiffness of the messenger cable cross section. This largely affects the global behaviour of the Stockbridge damper. The length of these zones complements the model parameters.
机译：架桥阻尼器被广泛用于减轻架空电线导体以及暴露于风的作用下的许多其他电缆或类电缆结构的涡流引起的振动。这项工作的目的是开发一个简单但准确的斯托克布里奇阻尼器的机械模型，以用于评估此类结构的振动。该模型基于吊索电缆的类似梁的描述以及横截面循环弯曲行为的非线性表示。在横截面水平上，用经典的Bouc-Wen磁滞模型再现了Messenger电缆的机械性能，该模型已被认为足以代表主要由线间滑动过程控制的局部性能。 Bouc-Wen模型参数是根据文献中提供的实验结果确定的，并在局部（横截面）水平上用于表征斜缆的机械性能。 Stockbridge阻尼器的整体性能下降与夹具的阻抗函数方面的实验结果相比非常有利，并且可以在全电源线的评估过程中放心使用建议的模型。突出显示了Messenger电缆末端区域的重要作用。在这些区域中，发现为使斜缆横截面的弯曲刚度发生了类似过渡的边界层。这在很大程度上影响了Stockbridge阻尼器的整体性能。这些区域的长度补充了模型参数。

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  • 来源
    《Mathematical Problems in Engineering》 |2018年第6期|8925121.1-8925121.17|共17页
  • 作者

    Foti Francesco; Martinelli Luca;

  • 作者单位

    Politecn Milan, Dept Civil & Environm Engn, Piazza L da Vinci 32, I-20133 Milan, Italy;

    Politecn Milan, Dept Civil & Environm Engn, Piazza L da Vinci 32, I-20133 Milan, Italy;

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